Total Addressable Market (TAM)

TAM is the first and largest ring in the market-sizing triad: TAM (Total Addressable Market), SAM (Serviceable Addressable Market, the portion you can realistically reach given your distribution and geography), and SOM (Serviceable Obtainable Market, the share you can realistically win in the near term). Investors and boards use TAM to assess whether a market opportunity is large enough to build a venture-scale business, while go-to-market teams use it to allocate resources across segments. There are three common methods for calculating TAM. Top-down analysis uses industry reports to estimate total market size and then carves out the relevant segment. Bottom-up analysis multiplies the number of potential customers by the average contract value to arrive at a revenue figure. Value-based analysis calculates TAM from the economic value delivered to customers rather than from category revenue. Bottom-up TAM calculations tend to be more credible to sophisticated buyers because they are grounded in real unit economics. For outbound sales teams, understanding TAM helps prioritize which segments receive the most intensive outreach. Outvid users who have mapped their TAM by vertical, company size, or geography can configure their AI video campaigns to focus on the highest-value segments first — maximizing revenue impact before expanding to adjacencies. A large TAM also signals to the team that volume outreach is worth investing in, rather than competing for a small number of accounts through pure relationship-based selling.